Method of removing stuck sprue

Details Method of removing stuck sprue Method of removing stuck sprue

1993-12-21

1995-02-21

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

With step of cleaning, polishing, or preconditioning...

264161, 2643281, 264334, 425DIG51, B29C 4540

Patent

active

053913329

ABSTRACT:
An improved method of removing a stuck sprue from the ejector assembly of an injection molding machine and a tool for use in the method in which the tool has a body with a hollow lower portion having a bottom edge with peripherally spaced indentations. In the method, the tool is first heated to above the melting point of the molding material and the lower end is inserted into the stuck sprue. The tool is cooled to below the melting point of the molding material and then rocked back and forth to free the sprue from the ejector mechanism.

REFERENCES:
patent: 3013303 (1961-12-01), Amazon
patent: 3208113 (1965-09-01), Bennett

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